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Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
strings
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Status
Standings
Custom test
Problems
#
Name
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3885
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3881
144C
Anagram Search
implementation
,
strings
1500
x3880
412C
Pattern
implementation
,
strings
1200
x3845
61B
Hard Work
strings
1300
x3779
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3757
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3734
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3710
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3700
358B
Dima and Text Messages
brute force
,
strings
1500
x3675
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3665
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3634
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3633
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3583
147A
Punctuation
implementation
,
strings
1300
x3548
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3506
7D
Palindrome Degree
hashing
,
strings
2200
x3491
91A
Newspaper Headline
greedy
,
strings
1500
x3447
278B
New Problem
brute force
,
strings
1500
x3415
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3413
928A
Login Verification
*special problem
,
strings
1200
x3330
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3326
346B
Lucky Common Subsequence
dp
,
strings
2000
x3314
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3199
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3183
682D
Alyona and Strings
dp
,
strings
1900
x3170
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3149
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3138
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3109
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3072
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3049
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3048
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2969
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2912
1183H
Subsequences (hard version)
dp
,
strings
1900
x2897
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2889
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2852
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2847
1267L
Lexicography
constructive algorithms
,
strings
1800
x2845
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2838
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2796
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2781
629C
Famil Door and Brackets
dp
,
strings
2000
x2733
1147B
Chladni Figure
brute force
,
strings
1900
x2726
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2706
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2680
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2591
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2587
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2584
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2584
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2583
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2581
494B
Obsessive String
dp
,
strings
2000
x2565
1303E
Erase Subsequences
dp
,
strings
2200
x2555
121B
Lucky Transformation
strings
1500
x2524
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2513
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2508
691C
Exponential notation
implementation
,
strings
1800
x2473
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2458
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2452
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2421
808G
Anthem of Berland
dp
,
strings
2300
x2392
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2384
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2379
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2351
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2350
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2345
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2331
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2322
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2297
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2251
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2249
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2237
113A
Grammar Lessons
implementation
,
strings
1600
x2230
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2226
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2168
25E
Test
hashing
,
strings
2200
x2164
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2091
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2084
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2054
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2049
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2046
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2024
1578H
Higher Order Functions
implementation
,
strings
1700
x1987
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1979
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1976
149E
Martian Strings
string suffix structures
,
strings
2300
x1966
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1964
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1961
250B
Restoring IPv6
implementation
,
strings
1500
x1945
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1939
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1937
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1934
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1930
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1926
883E
Field of Wonders
implementation
,
strings
1500
x1876
81B
Sequence Formatting
implementation
,
strings
1700
x1872
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